The Sarah Jane Adventures characters

Sarah Jane Smith is a fictional character played by Elisabeth Sladen in the long-running BBC Television science fiction series Doctor Who and two of its spin-offs. Sarah Jane is a dogged investigative journalist who first encounters alien time traveller the Doctor while trying to break a story on a top secret research facility, and subsequently becomes his travelling companion on a series of adventures spanning the breadth of space and time. After travelling with The Doctor in four seasons of the show they suddenly part ways, and after this she continues to investigate strange goings-on back on Earth. Over time, Sarah Jane establishes herself as a committed defender of Earth from alien invasions and other threats, occasionally reuniting with The Doctor in the course of her own adventures, all the while continuing to work as a freelance investigative journalist.

The Eleventh Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is played by Matt Smith in three series as well as five specials. As with previous incarnations of the Doctor, the character has also appeared in other Doctor Who spin-offs.

K-9 is the name of several fictional robotic canines (the name being a pun on that word) in the long-running British science fiction television series, Doctor Who, first appearing in 1977. K-9 has also been a central character in three of the series television spin-offs: the one-off K-9 and Company (1981), The Sarah Jane Adventures (2007–2011) and K-9 (2009–2010). Although not originally intended to be a recurring character in the series, K-9 was kept in the show following his first appearance because he was expected to be popular with younger audiences. There have been at least four separate K-9 units in the series, with the first two being companions of the Fourth Doctor. Voice actor John Leeson has provided the character's voice in most of his appearances, except during Season 17 of Doctor Who, in which David Brierley temporarily provided the character's voice. The character was created by Bob Baker and Dave Martin, to whom rights to the character still belong; consequently, Baker's spin-off series K-9, which is not BBC-produced, cannot directly reference events or characters from Doctor Who, though it attempts to be a part of that continuity.

Brigadier Sir Alistair Gordon Lethbridge-Stewart, generally referred to simply as the Brigadier, is a fictional character in the British science fiction television series Doctor Who, played by Nicholas Courtney. He is one of the founders of UNIT (United Nations Intelligence Taskforce), an international organization that defends Earth from alien threats, and serves as commander of the British contingent.

Rani Chandra is a fictional character played by Anjli Mohindra in the British children's science fiction television programme The Sarah Jane Adventures, a spin-off from the long-running series Doctor Who. She first appeared in The Day of the Clown.

The Sarah Jane Adventures is a British science fiction television programme that was produced by BBC Cymru Wales for CBBC, created by Russell T Davies, and starring Elisabeth Sladen. The programme is a spin-off of the long-running BBC science fiction programme Doctor Who and is aimed at a younger audience than Doctor Who. It focuses on the adventures of Sarah Jane Smith, an investigative journalist living in Ealing, London, who, as a young woman, had numerous adventures across time and space with the Doctor. Following Sladen's death in 2011, the BBC confirmed that the show would not return for a sixth series.

Luke Smith is a fictional regular character played by Tommy Knight in the British children's science fiction television series The Sarah Jane Adventures, a spin-off of the long-running series Doctor Who. Luke is a regular character in The Sarah Jane Adventures both in television and audio adventures. He has also appeared in three episodes of Doctor Who: the two-parter "The Stolen Earth"/"Journey's End" (2008), and the Tenth Doctor's finale episode "The End of Time, Part Two" (2010).

The Tenth Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is played by David Tennant in three series and nine specials. The character has also appeared in other Doctor Who spin-offs. In 2023, Tennant returned to the role, this time as the fourteenth incarnation of the Doctor.

The Sarah Jane Adventures is a British science fiction television programme that was produced by BBC Cymru Wales for CBBC, created by Russell T Davies, and starring Elisabeth Sladen. The programme is a spin-off of the long-running BBC science fiction programme Doctor Who and is aimed at a younger audience than Doctor Who. It focuses on the adventures of Sarah Jane Smith, an investigative journalist living in Ealing, London, who, as a young woman, had numerous adventures across time and space with the Doctor. Following Sladen's death in 2011, the BBC confirmed that the show would not return for a sixth series.

The Sarah Jane Adventures is a British science fiction television programme that was produced by BBC Cymru Wales for CBBC, created by Russell T Davies, and starring Elisabeth Sladen. The programme is a spin-off of the long-running BBC science fiction programme Doctor Who and is aimed at a younger audience than Doctor Who. It focuses on the adventures of Sarah Jane Smith, an investigative journalist living in Ealing, London, who, as a young woman, had numerous adventures across time and space with the Doctor. Following Sladen's death in 2011, the BBC confirmed that the show would not return for a sixth series.